JPH0776724B2 - Vehicle diagnostic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention selectively selects and fixes a plurality of model-specific control programs in a vehicle diagnostic device in correspondence with a model code stored in a vehicle-mounted electronic control device. The present invention relates to a vehicle diagnostic device capable of being selectively fixed by external input and enabling bidirectional communication with an on-vehicle electronic control device.

[Prior Art] In recent years, an engine mounted on a vehicle electronically controls air-fuelization and the like by an electronic control unit to exhibit comfortable drivability, exhaust gas purification, fuel economy, and engine output. Are being improved.

Therefore, unless the input signals input to the electronic control unit from various sensors and switches that detect the engine state, or the output signals to various actuators such as injectors are accurate, it is difficult to control the engine accurately. This causes a decrease in drivability, deterioration of exhaust emission or fuel consumption, and a decrease in engine output.

In recent complicated electronic control systems,
Even if a failure occurs in sensors, switches, or actuators, it is difficult to immediately understand the cause of the failure.In dealer service factories, etc., it is necessary to connect these to the in-vehicle electronic control device and It is essential to equip a so-called hand computer, which is a vehicle diagnostic device that checks input and output data.

By the way, the memory address of the electronic control unit mounted on the vehicle, the communication system, etc. differ depending on the model.
The model code is stored in advance in the electronic control unit as shown in JP-A-61-127054 and JP-A-61-253512. The model of the vehicle diagnostic device is recognized by the model code stored in the in-vehicle electronic control device.

Therefore, for example, in a vehicle diagnostic device disclosed in Japanese Patent Laid-Open No. 58-12848, which uses a dedicated checker to diagnose the operating states of various sensors and actuators, an electronic control device having a different model code is used. It cannot be used for vehicles equipped with, and the compatible models will be limited.

In JP-A-57-22530, the type of inspection and maintenance required for the vehicle to be inspected is input by operating the inspection type selection device of the operation console, and the vehicle type number search table is used. Vehicle type of inspected vehicle,
By indexing the applicable vehicle type number from the specifications and inputting this number by operating the vehicle type number input device, the inspection item selection circuit via the central control unit will correspond to the vehicle type and specifications of the vehicle and check type. The inspection items corresponding to the items are sequentially selected from the inspection item storage circuit and displayed on the display device, so that the diagnostic operator can perform the inspection work according to the display on the display device, thereby facilitating the inspection work and the inspection item selection circuit. By operating the measuring equipment automatically according to the command from, and making the measurement about the inspection item automatically, the inspection work is facilitated, and only the required inspection item is selected by the inspection item selection circuit. A technique for minimizing the capacity of the inspection item storage circuit is disclosed.

However, in this queue, the inspection items are sequentially displayed according to the type of the inspection and maintenance that has been input and the vehicle type number of the vehicle to be inspected, and the measuring equipment is only automatically operated. Since the input / output data inside the electronic control unit is not diagnosed by bidirectional communication with the electronic control unit, the data diagnosis inside the electronic control unit cannot be performed, and the failure diagnosis of the entire electronic control system can be performed. I can't do it.

In order to deal with this, it is conceivable that the vehicle diagnostic device can be bidirectionally communicated with the on-vehicle electronic control device, and the control programs corresponding to all models are stored in the memory of the vehicle diagnostic device.

[Problems to be Solved by the Invention] However, since the memory capacity of the vehicle diagnostic device is limited, it is not possible to store control programs corresponding to all models.

On the other hand, in the control program, only the model code is different, and other diagnostic programs, communication systems, etc. are all common, but they cannot be shared because the model codes are different, and the corresponding model code A vehicle diagnosis device having a control program must be selected, which complicates the work and hinders the original vehicle diagnosis work.

The present invention has been made in view of the above circumstances, and a control program corresponding to a model code stored in an in-vehicle electronic control device is automatically selected and fixed, and a control program common to all other than the model code. It is an object of the present invention to provide a vehicle diagnostic device that can be shared and can facilitate the diagnostic work.

[Means for Solving the Problems] In order to achieve the above object, the vehicle diagnostic device according to the present invention is connected to an in-vehicle electronic control device in which a model code is stored in advance, and the electronic control device of the electronic control device is connected by bidirectional communication. In a vehicle diagnostic device for diagnosing input / output data, a storage means for storing a plurality of control programs different for each model code, and a corresponding control program for reading the model code stored in the in-vehicle electronic control device are stored. A model for selectively fixing the control program stored in the storage means in accordance with an external input when there is no control program corresponding to the model code read from the electronic control unit. And a code discriminating means.

[Operation] With the above configuration, when the vehicle diagnostic device is connected to the vehicle-mounted electronic control device to diagnose the input / output data of the electronic control device, the model code stored in the vehicle-mounted electronic control device by bidirectional communication is used. A control program corresponding to the model code is selectively fixed from a plurality of control programs read by the diagnostic device and stored in the storage means of the vehicle diagnostic device, which are different for each model code.

Further, when there is no control program corresponding to the read model code, the control program is selected and fixed from the storage means according to the external input.

Embodiment An embodiment of the present invention will be specifically described below with reference to the drawings.

1 shows a schematic side view of a vehicle, FIG. 1 (b) is a front view of a vehicle diagnostic device, and FIG.
FIG. 3 is a circuit configuration diagram of an on-vehicle electronic control unit and a vehicle diagnostic device, FIG. 3 is a functional block diagram of the vehicle diagnostic device, and FIG. 4 is a control program for each model code stored in the ROM of the vehicle diagnostic device. Conceptual diagram, FIG. 5 is a flowchart showing a vehicle diagnosis procedure in the vehicle diagnosis device.

In the figure, reference numeral 1 is a vehicle such as an automobile, and 2 is an electronic control unit mounted on the vehicle 1 for performing air-fuel ratio control (hereinafter referred to as “vehicle-mounted EC”).
U ”), the vehicle-mounted ECU 2 is a central processing unit (CPU) 3, RAM
4, ROM 5, input interface 6, and output interface 7 are composed of a microcomputer and peripheral devices connected via a bus line 8.

Further, the input interface 6 is provided with a water temperature signal TW of the cooling water temperature sensor 9, an air-fuel ratio signal 02 of the 02 sensor 10, an intake air amount signal Q of the intake air amount sensor 11, a vehicle speed signal S of the vehicle speed sensor 13, a throttle opening sensor. 15 throttle opening signal Tr
θ, engine speed sensor speed signal N, and other sensor signals, and air conditioner switch SW1 air conditioner operation signal A
Switch signals such as C, the idle operation signal ID of the idle switch SW2, and the neutral operation signal NT of the neutral switch SW3 are input.

In the vehicle-mounted ECU2, the various signals are processed according to the program stored in the ROM5 and once stored in the RAM4, the CPU3 performs various arithmetic processing based on the stored data, and the arithmetic processing is performed. Based on the data
Through the output interface 7 and the drive circuit 18, the kick down solenoid 12, the fuel pump relay 14, the canister purge solenoid 19, the EGR actuator 20, the idle control actuator 21, the ignition coil
A control signal is output to 22 and the injector 23.

The ROM 5 also stores fixed data such as the model code and year of the vehicle 1.

Further, the constant voltage circuit 16 that supplies a constant voltage to each operating unit of the serial ECU 2 is connected to the battery BV via the relay contact 43a of the power relay 43. Further, the exciting coil 43b of the power relay 43 is freely connected to the battery BV via the ignition terminal IG of the ignition switch 45.

Further, the vehicle-mounted ECU 2 is provided with a dealer self-diagnosis lamp (D check lamp) 23a. When the self-diagnosis function built into the vehicle-mounted ECU 2 detects an abnormality in the system, the D-check lamp 23a reads out a trouble code corresponding to the faulty part from the ROM 5 and displays the faulty part. Turns on multiple lamps as appropriate, and displays a trouble code by the number of blinks.

The instrument panel of the vehicle 1 is provided with a user self-diagnosis lamp (U check lamp) 23b. When the self-diagnosis function detects a system abnormality, the self-diagnosis lamp 23b is turned on to warn the driver of the abnormality.

Further, the vehicle-mounted ECU 2 is provided with an external connection connector 24, and the external connection connector 24 is connected to the vehicle diagnostic device.
Input / output connector 2 provided on 25 vehicle diagnostic device main bodies 25a
6 is connected via the adapter harness 27.

This vehicle diagnostic device 25 is provided in a service factory such as a dealer, and is provided with a control unit 28 including a microcomputer, a power supply circuit 29, and the like inside,
An indicator unit 30, a display 31, a keyboard 32, etc. are provided outside. Further, a memory cartridge 34, which can be connected from the outside, is connected to the control unit 28 via a connection connector 33.

The control unit 28 includes a CPU 36, a RAM 37, a timer 38 including a frequency counter, which are connected to each other via a bus line 35.
First and second I / O ports 39 and 40 are provided.

Then, on the input side of the first I / O port 39, in the vehicle-mounted ECU 2 corresponding to the mode selection signal from the keyboard 32 and various control signals output from the output interface 7 of the vehicle-mounted ECU 2 to the drive circuit 18, The output data and the input data in the vehicle-mounted ECU 2 input from the various sensors are input. In addition, the output side of the first I / O port 39 is the in-vehicle E
It is connected to the input interface 6 of the CU 2 and the display 31.

On the input side of the second I / O port 40, the input data in the vehicle-mounted ECU 2 input from the above-mentioned various switches are mounted in the vehicle-mounted EC.
It is input through the output interface 7 of U2, and the output side is connected to the indicator unit 30.

The indicator section 30 is composed of light emitting diodes (LED) D1 to D10 arranged in two rows, and the light emitting diodes D1 to D10 at a specific location are lit (or blinking).
Is for confirming the input / output state of the switches, sensors, actuators, that is, the operating state.

Further, the display 31 is composed of, for example, liquid crystal cells arranged in two rows of 14 in each row, the output voltage of each sensor, the measured value of the pulse width for the actuators, the sensors, The identification symbols (abbreviations) of the actuators and the diagnostic mode are displayed (see FIG. 1 (b)).

Further, the memory cartridge 34 is provided in the vehicle diagnostic device main body 25a for the program of the vehicle-mounted ECU 2 which is different for each vehicle type.
It is designed to be selectively connectable via the connection connector 33 so as to be compatible with itself, and internally stores a plurality of model-specific control programs and fixed data corresponding to the model code of each vehicle 1. A ROM 41 as a storage means for storing the data is stored.

That is, as shown in FIG. 4, a plurality of tables TB1 to TBn stored in the ROM 41 store different control programs for each model code, and are identified by the diagnostic mode of each control program. Various data such as a memory address corresponding to the model, a communication system, and a diagnostic program are stored in the area to be stored.

During the diagnostic work, when the vehicle diagnostic device 25 is connected to the vehicle-mounted ECU 2 and the power is turned on, the control program is selected and fixed corresponding to the model code stored in the vehicle-mounted ECU 2, and the operator selects the desired diagnostic mode from the keyboard 32. By inputting at, the diagnostic program corresponding to the diagnostic mode in the fixed control program is selected, the program is executed in accordance with the diagnostic program, and the measured values and the like are displayed on the display 31.

Further, the timer 38 is provided with a clock pulse oscillating element 42 which outputs a synchronizing signal.

Further, the power supply circuit 29 connected to the control unit 28 is connected to the battery BV of the vehicle 1 via the power switch SW4.

Next, the functional configuration of the vehicle diagnostic device 25 will be described with reference to FIG.

The keyboard interpreting means 51 interprets the designated mode input from the keyboard 32.

The model code discriminating means 52 reads the model code previously stored in the ROM 5 of the vehicle-mounted ECU 2 read by the bidirectional communication via the data communication means 53 described later, and reads the corresponding control program from the ROM 41 of the vehicle diagnostic device 25. A plurality of tables TB1 to TBn stored in, that is, a plurality of control programs different for each model code are selected and fixed. If there is no control program corresponding to the model code that was read, the keyboard 32
Select and fix the control program according to the external input from.

When the vehicle diagnostic device 25 is powered on, the data communication means 53 first requests the vehicle-mounted ECU 2 to transmit the model code prior to the diagnosis, receives the model code transmitted from the vehicle-mounted ECU 2, and then the above. According to the designated mode (diagnostic mode) interpreted by the keyboard interpreting means 51, a designated area corresponding to the designated mode of the fixed control program is searched, and according to the diagnostic program stored in the designated area, the onboard ECU 2 is searched. The transmission request signal TX of the corresponding data is output, and the data RX output from this vehicle-mounted ECU 2 is received.

The data calculation means 54 performs arithmetic processing on the data received by the data communication means 53 to convert the physical quantity (binary number data to 10
Convert to decimal and convert to numerical data).

The display drive means 55 outputs the result calculated by the data calculation means 54 to the display 31 and causes the display 31 to display numerical data.

Next, the operation procedure of the vehicle diagnostic device 25 will be described with reference to FIG.

Attach the memory college 34 to the vehicle diagnostic device body 25a,
In addition, after connecting the input / output connector 26 to the external connection connector 24 of the vehicle-mounted ECU 2 via the adapter harness 27, the power switch SW4 is turned on to turn on the vehicle diagnostic device 25.

Then, first, the vehicle diagnostic device 25 is system-initialized in step 102, and then the process proceeds to step 103.
In order to read the model code stored in the ROM5 of the vehicle-mounted ECU2, a model code request signal is output to the vehicle-mounted ECU2.
Then, in step 104, the vehicle-mounted ECU 2 responds and receives the model code transmitted from the vehicle-mounted ECU 2.

Next, in step 105, the control program corresponding to the received model code is searched from the plurality of tables TB1 to TBn stored in the ROM 41, and it is determined whether or not there is a control program corresponding to the model code. To determine.

Then, if there is a control program corresponding to the corresponding model code and the model code can be determined, the process proceeds to step 106, and if there is no control program corresponding to the model code and the model code cannot be determined, the display 31 is displayed. While displaying an error, step 107
Go to.

If an error message is displayed on the display 31 of the vehicle diagnostic device 25 because the model code cannot be identified, the worker refers to the comparison table in the service manual and refers to specifications other than the model code, that is, communication system, diagnostic program, etc. The model code of the control program that is common to all is searched, and the model code of the control program is entered using the keyboard 32 (step 107).

Then, if the model code input from the keyboard 32 is the model code output from the in-vehicle ECU 2,
It is read in a pseudo manner, and the process proceeds to step 106.

For example, the model code stored in the ROM 5 of the vehicle-mounted ECU 2 and transmitted from the vehicle-mounted ECU 2 is “6789”, there is no model code corresponding to the model code in the ROM 41 of the vehicle diagnostic device 25, and the vehicle diagnostic device 25 When an error is displayed on the display 31, the diagnostic operator refers to the comparison table of the service manual based on the vehicle model, vehicle number, etc., and in the plurality of tables TB1 to TBn of the ROM 41 of the vehicle diagnostic device 25, other than the model code If there is a control program that is common to all, the model code of that control program (for example, "1234") is displayed on the keyboard 32 as 1 → 2 → 3 → 4.
→ Enter /. Then, the model code (“1234”) externally input by the keyboard 32 is pseudo read as the model code from the vehicle-mounted ECU 2.

Then, the process proceeds to step 106, and the model code discriminated in step 105 or the model code input in step 107 is stored in a predetermined address of the RAM 37 of the vehicle diagnostic device body 25a.

Next, at step 108, the control program corresponding to the stored model code is set to the vehicle diagnostic device 25.
Of the plurality of tables TB1 to TBn stored in the ROM 41 are automatically selected and fixed (for example, the control program stored in TB1 is selected and fixed). As a result, a control program corresponding to the program of the vehicle-mounted ECU 2 is specified, and thereafter, the diagnostic procedure from step 109 onward is executed according to this control program.

For example, the vehicle-mounted ECU 2 based on the output signal of the cooling water temperature sensor 9
When diagnosing the cooling water temperature data of No. 1, the diagnostic operator selects the diagnostic mode corresponding to the keyboard 32, for example, F → 0 → 7 →
Enter ENT (step 109). Then, step 110
Proceed to, this diagnostic mode is the CPU36 of the vehicle diagnostic device body 25a.
The diagnostic mode stored in the RAM 37 is read out and its contents are interpreted. Then, the diagnostic program stored in the corresponding mode of the table TB1, for example, the cooling water temperature sensor output data display program stored in the area corresponding to the mode 07 is specified.

Then, in step 111, a transmission request signal TX of data corresponding to the diagnostic mode is output from the vehicle diagnostic device 25 to the vehicle-mounted ECU 2 in accordance with the identified diagnostic program. Then, the data signal RX corresponding to the data transmission request signal TX is output from the vehicle-mounted ECU 2 to the vehicle diagnostic device 25, and is received in step 112.

Next, in step 113, the received data is arithmetically processed, the binary data is converted into the decimal data in the physical quantity,
Go to step 114.

In step 114, the arithmetic data converted into the physical quantity is output to the display 31 via the first I / O port 39.
Then, on this display 31, a numerical value display (for example, +14 deg C) based on the above calculation result and an identification symbol (for example, Tw:
The abbreviation of cooling water temperature) and the diagnostic mode (FO7) input with the keyboard 31 are displayed (see FIG. 1 (b)).

In addition, when executing a new diagnostic item,
By inputting a desired diagnostic mode to the keyboard 32, the process returns to step 109 and the failure diagnostic program is executed in accordance with the corresponding diagnostic mode. As a result, the numerical values of input / output data of other sensors and actuators are displayed on the above display.
31 can be displayed.

As described above, when the diagnostic program, the communication system, etc., all have a common control program other than the model code, it is possible to share a control program having only this model code, which improves the diagnostic workability.

As described above in detail, according to the present invention, the control program corresponding to the model code stored in the electronic control unit mounted on the vehicle is automatically selected and fixed by the vehicle diagnostic device. Good workability.

If there is no control program corresponding to the model code stored in the in-vehicle electronic control unit, the control program can be selected and fixed by external input. When the specifications of the diagnostic program, the communication system, etc. are all common, the corresponding control program can be selected and fixed by an external input and shared, and the diagnostic work can be facilitated.

[Brief description of drawings]

1 shows a schematic side view of a vehicle, FIG. 1 (b) is a front view of a vehicle diagnostic device, and FIG.
FIG. 3 is a circuit configuration diagram of an on-vehicle electronic control unit and a vehicle diagnostic device, FIG. 3 is a functional block diagram of the vehicle diagnostic device, and FIG. 4 is a control program for each model code stored in the ROM of the vehicle diagnostic device. Conceptual diagram, FIG. 5 is a flowchart showing a vehicle diagnosis procedure in the vehicle diagnosis device. 1 ... Vehicle, 2 ... In-vehicle electronic control device, 5 ... ROM, 2
5 …… Vehicle diagnosis device, 41 …… ROM (storage means), 52 …… Model code discrimination means.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP 61-253512 (JP, A) JP 57-22530 (JP, A) JP 61-127054 (JP, U)

Claims (1)

[Claims] 1. A vehicle diagnostic device which is connected to an on-vehicle electronic control device in which a model code is stored in advance and which diagnoses input / output data of the electronic control device by bidirectional communication. The storage means for storing the control program and the model code stored in the on-vehicle electronic control device are read, and the corresponding control program is selected and fixed from the storage means, and the corresponding model code is read from the electronic control device. If there is no control program to be executed, the vehicle type diagnostic device is provided with a model code discriminating means for selectively fixing one of the control programs stored in the storage means in accordance with an external input.